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I have an svg with transitions set on it. Now when I add a class to it which has some properties varied then the transition only occur if I add delay between DOMContentLoaded event and addclass event. Here are two example, first with no delay second with an infinitesmall delay:

Without Delay:

! function() {
  window.addEventListener('DOMContentLoaded', function() {
    var logo2 = document.querySelector("svg");
    logo2.classList.add('start');
  });
}();
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 104.75 32.46">
            <defs>
                <style>
                polygon {
                    fill: red;
                    transition: opacity 3s ease-out, transform 3s ease-out;
                    opacity: 0;
                }

                .start polygon {
                opacity: 1;
                }

#A1 polygon {
transform: translate(100px, 100px);
transition-delay: 1s;
}

/*styles after animation starts*/
.start #A1 polygon {
transform: translate(0px, 0px);
}


            </style>
            </defs>
            <title>Logo</title>
            <g id="A1">
                
                <polygon  class="right" points="0.33 31.97 0.81 26.09 13.61 3.84 13.13 9.72 0.33 31.97" />
            </g>
            </svg>
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1 Answer

Because that's what DOMContentLoaded does : it fires when the DOM has been parsed, but before the CSSOM has been (and thus before styles have been applied).

If you don't want to wait for the load event,
one way is to force the browser to paint before your script execution (synchronously), by calling offsetXXX property on any document's element (e.g <body>) :

! function() {
  window.addEventListener('DOMContentLoaded', function(){
    document.body.offsetTop; // force a CSS repaint
    var logo2 = document.querySelector("svg");
    logo2.classList.add('start');
  });
}();
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 104.75 32.46">
  <defs>
    <style>
      polygon {
        fill: red;
        transition: opacity 3s ease-out, transform 3s ease-out;
        opacity: 0;
      }
      .start polygon {
        opacity: 1;
      }
      #A1 polygon {
        transform: translate(100px, 100px);
        transition-delay: 1s;
      }
      /*styles after animation starts*/
      .start #A1 polygon {
        transform: translate(0px, 0px);
      }
    </style>
  </defs>
  <title>Logo</title>
  <g id="A1">
    <polygon class="right" points="0.33 31.97 0.81 26.09 13.61 3.84 13.13 9.72 0.33 31.97" />
  </g>
</svg>

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
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